US Patent: 481,506


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US Patent: 481,506

Wrench

Patentee:

Bernard McGilvray (exact or similar names) - Washington, DC

USPTO Classifications:

81/184

Tool Categories:

wrenches : pipe and nut combination wrenches

Assignees:

Bernard McGilvray - Washington, DC

Frederic W. Ritter, Jr. - Washington, DC

Manufacturer:

Not known to have been produced

Witnesses:

F. R. Cornwall

I. M. Cornwall

Percy B. Hills

Patent Dates:
Applied:	May 10, 1892
Granted:	Aug. 23, 1892

Patent Pictures:

Bernard McGilvray patent August 23, 1892

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Description:

Screw adjusting combination nut and pipe wrench. The adjusting rosette has holes for insertion of a rod for extra leverage. The intermediate jaw piece has pipe gripping teeth on one face, and spring clips to hold it in place when used for gripping pipe.